What is the correct drill bit size for pre-drilling screw holes?

The corner braces come with wood screws that are only 1/2" long. In many softer materials, such as wood or plywood, no tap-hole will be needed--the screws will be effectively self-tapping.

Can we use this on a metal square tube to hold the wooden plank?

With a proper hole drilled into the metal tube, a sheet metal screw could be used. The same type screws could work for attaching o the plank, assuming proper diameter holes were drilled.

Thinking of using these to shore up a cheap, particle board shelving unit. Would this work?

I used them to mount 3 19x15-inch 11/16-inch thick particle board shelves in a utility closet and they're holding well. Byu the way. I tried to drill a third mount hole in a bracket and when the drill heated up the bracket, it hardened, ruining a drill bit. My brother told me about this tendency with certain grades of steel and apparently this is one of those. Back to your project. If the shelves aren't too long or the particle board too thin, and prone to bowing under weight, these will work. If the shelf can bow, I believe the weight will eventually pull the screws out of the board rather nastily. hth.

Can I use these for corner shelves and will they hold them up themselves?

Yes they work with everything! They are small so use a couple to hold a small shelf on each side

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Blingstar L Bracket Stainless Steel Corner Brace 16 Pcs 1.57x1.57 Inch Joint Right Angle Bracket 90 Degree Corner Fastener for Wood Furniture Bedframe Cabinet Drawer Chair, with 64 Pcs Screws, Black

Blingstar L Bracket Stainless Steel Corner Brace 16 Pcs 1.57x1.57 Inch Joint Right Angle Bracket 90 Degree Corner Fastener for Wood Furniture Bedframe Cabinet Drawer Chair, with 64 Pcs Screws, Black

Product ID: 217072109

Details

Brand
Blingstar
Color
Black
Finish Type
Painted
Item Weight
0.31 Kilograms
Material
Stainless

📏1.57x1.57 inch size

🔩64 high-hardness screws included

🛡️Premium rust-resistant stainless steel

Description

🛠️ Reinforce with confidence, style, and zero wobble!

RUSTPROOF DURABILITY - Crafted from high-quality stainless steel with smooth, burr-free edges to protect your furniture and ensure longevity.
EFFORTLESS INSTALLATION - Deep-thread screws and counterbore holes guarantee a flush, firm grip—no protrusions, no hassle.
VERSATILE DIY ESSENTIAL - Perfect for stabilizing bookshelves, cabinets, tables, and more—ideal for millennial pros upgrading their living spaces.
COMPLETE REINFORCEMENT KIT - 16 braces paired with 64 self-tapping screws for a secure, all-in-one solution.
PRECISION FIT MAXIMUM STRENGTH - Compact 1.57x1.57 inch braces engineered for seamless corner reinforcement without bulk.

The Blingstar Black Corner Brace set includes 16 premium stainless steel L-brackets (1.57x1.57 inches) and 64 high-hardness iron screws designed for robust, rust-resistant reinforcement of wood furniture corners. Engineered for easy installation with deep-thread, self-tapping screws and smooth, coated edges, this kit is the perfect upgrade for millennial professionals seeking durable, sleek hardware to stabilize and elevate their home projects.

Specifications

ASIN	B088PQ4QVN
Best Sellers Rank	#69,365 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #608 in Hardware Brackets #29,598 in Hardware
Brand Name	Blingstar
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (3,820)
Finish Types	Painted
Item Depth	38 mm
Item Weight	0.31 Kilograms
Manufacturer	Blingstar
Material Type	Stainless Steel
Model Number	2701663b-8180-4541-a2b3-bc3f19716611
Mounting Type	Corner Mount
Set Name	16pcs Corner Brace Set
UPC	655100546479
Unit Count	16.0 Count

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